ansi_c_pg46_ch02_ex04.c

/*
 * Exercise 2-4.
 * Write an alternative version of squeeze(s1,s2) that deletes each character
 * in s1 that matches any character in the string s2.
 */


#include <stdio.h>


int squeeze(char *s1, const char* s2) {
	int i, j;
	int k = 0;

	for (i = 0; s1[i] ; i++) {
		for (j = 0; s2[j]; j++) {
			if (s1[i] == s2[j]) {
				break;
			}
		}
		if (!s2[j])
			s1[k++] = s1[i];
	}
	s1[k] = '\0';
}

int any(char *s1, const char* s2) {
	int i, j;

	for (i = 0; s1[i]; i++) {
		for (j = 0; s2[j]; j++) {
			if (s1[i] == s2[j]) {
				return i;
			}
		}
	}

	return -1;
}

int
main(int argc, char** argv) {

	printf ("any(%s,%s) = %d\n", argv[1], argv[2], any(argv[1], argv[2]));

	squeeze(argv[1], argv[2]);
	printf ("squeeze = %s\n", argv[1]);

	return (0);
}